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Proceedings Paper

RAIRS, TPD, and TOF-QMS study of the 248-nm photolysis of CH3I thin films on Ag(111)
Author(s): S. R. Coon; K. B. Myli; Vicki H. Grassian
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Paper Abstract

The 248 nm photochemistry of methyl iodide thin films was studied using reflection absorption infrared spectroscopy (RAIRS), temperature programmed desorption (TPD) and time-of-flight quadrupole mass spectrometry (TOF-QMS). The formation of two major photoproducts, CH2I2 and CH4, in the film was characterized by RAIRS and TPD. At all laser energies used in this study, CH3, I, and CH3I were ejected into the gas phase. The CH3 TOF distribution showed the signature of gas phase CH3I photodissociation dynamics--two sharp peaks corresponding to production of iodine atoms in the I (2P3/2) and I* (2P1/2) states. The TOF distributions of I and CH3I were fit to Maxwell-Boltzmann distributions corresponding to temperatures of 1400 K and 1170 K, respectively. The photochemistry of methyl iodide thin films can be understood in terms of photoprocess occurring in the film and at the film surface.

Paper Details

Date Published: 25 September 1995
PDF: 6 pages
Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); doi: 10.1117/12.221478
Show Author Affiliations
S. R. Coon, Univ. of Iowa (United States)
K. B. Myli, Univ. of Iowa (United States)
Vicki H. Grassian, Univ. of Iowa (United States)


Published in SPIE Proceedings Vol. 2547:
Laser Techniques for Surface Science II
Janice M. Hicks; Wilson Ho; Hai-Lung Dai, Editor(s)

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